Electro-responsive surfaces with controllable wrinkling patterns for switchable light reflection–diffusion–grating devices

Lin, I-Ting; Choi, Yeon Sik; Wojcik, Charles C.; Wang, Tiesheng; Kar‐Narayan, Sohini; Smoukov, Stoyan K.

doi:10.1016/j.mattod.2020.09.028

Cited by 15 publications

(10 citation statements)

References 52 publications

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“…Because of the link between the shape and the size of the polymer film and those of the developed nanoscale-controlled colored pattern, changing the surface tension of cured films via the deposition of polymer solutions through micrometer-scale masks or submicrometer size, or by lithography, could produce patterns smaller than those achieved in the present study. This may inspire applications in nanophotonics, large-angle diffraction, or reflection–diffusion–grating devices. − …”

Section: Discussionmentioning

confidence: 99%

Self-Assembly of Twisted Monolayer Cholesteric Films via Surface Tension Local Anisotropy: Implications for Multicolor Optical Tags

Mitov

Boyon

Soldan³

2022

ACS Appl. Nano Mater.

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Colorful, cholesteric patterns are ubiquitous in the bodies of insects and fishes. Bioinspired materials may be employed in smart coatings for optical communication, signaling, and camouflage.However, due to the fundamental challenges associated with such application, the development of adaptive monolayers with continuous, hierarchical nanoscale and micrometer-scale structures, as found in nature, and design simplicity has not been fully explored. We show that controlling the local anisotropy of surface tension during the self-assembly of a twisted cholesteric oligomer can lead to the appearance of distinct coexisting colors in monolayer films. The reflection wavelength, which is proportional to the helical pitch, is tuned by forming transparent, surface-active films on the free side of a cholesteric film with a pitch gradient. Reflective colors are related to the internal nanoscale structure, as demonstrated by transmission electron microscopy. Open and selfsustaining bicolor tags are created. The surface design of these films allows the manipulation of their bulk chiral self-organization on a variety of substrates. Smart, reflective multicolor tags, including self-guiding systems for autonomous vehicles, functional facades, camouflage skins for robots, and anti-counterfeiting labels, are the intended application.

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Section: Discussionmentioning

confidence: 99%

Self-Assembly of Twisted Monolayer Cholesteric Films via Surface Tension Local Anisotropy: Implications for Multicolor Optical Tags

Mitov

Boyon

Soldan³

2022

ACS Appl. Nano Mater.

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“…Similarly, Kar-Narayan and Smoukov et al [ 68 ] reported the fabrication of controllable regular/irregular wrinkled patterns by a selective electron response system for a responsive polymer coating on underlying counter electrode patterns without requiring mechanical pre-stretch stimuli or the induction of anisotropy in the film. The electrode patterns were created by an aerosol jet printing method, introducing silver nanoparticles to form patterns on the bottom electrode.…”

Section: Desing Of Adaptive Wrinkled Patterned Surfaces: Reversible S...mentioning

confidence: 99%

Section: Figurementioning

confidence: 99%

Smart Polymer Surfaces with Complex Wrinkled Patterns: Reversible, Non-Planar, Gradient, and Hierarchical Structures

et al. 2023

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This review summarizes the relevant developments in preparing wrinkled structures with variable characteristics. These include the formation of smart interfaces with reversible wrinkle formation, the construction of wrinkles in non-planar supports, or, more interestingly, the development of complex hierarchically structured wrinkled patterns. Smart wrinkled surfaces obtained using light-responsive, pH-responsive, temperature-responsive, and electromagnetic-responsive polymers are thoroughly described. These systems control the formation of wrinkles in particular surface positions and the reversible construction of planar-wrinkled surfaces. This know-how of non-planar substrates has been recently extended to other structures, thus forming wrinkled patterns on solid, hollow spheres, cylinders, and cylindrical tubes. Finally, this bibliographic analysis also presents some illustrative examples of the potential of wrinkle formation to create more complex patterns, including gradient structures and hierarchically multiscale-ordered wrinkles. The orientation and the wrinkle characteristics (amplitude and period) can also be modulated according to the requested application.

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“…In particular, the tuning of flexible film morphology can be achieved by the application of a perpendicular electric field, which induces the surface hydrodynamic instability and wrinkled pattern appearance [145][146][147]. In the common case, this phenomenon was known to be irreversible, but recently the reversible and spatially selective surface morphology tuning was demonstrated, see Figure 12 [148].…”

Section: Electro-responsive Coatingsmentioning

confidence: 99%

Physically Switchable Antimicrobial Surfaces and Coatings: General Concept and Recent Achievements

et al. 2021

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Bacterial environmental colonization and subsequent biofilm formation on surfaces represents a significant and alarming problem in various fields, ranging from contamination of medical devices up to safe food packaging. Therefore, the development of surfaces resistant to bacterial colonization is a challenging and actively solved task. In this field, the current promising direction is the design and creation of nanostructured smart surfaces with on-demand activated amicrobial protection. Various surface activation methods have been described recently. In this review article, we focused on the “physical” activation of nanostructured surfaces. In the first part of the review, we briefly describe the basic principles and common approaches of external stimulus application and surface activation, including the temperature-, light-, electric- or magnetic-field-based surface triggering, as well as mechanically induced surface antimicrobial protection. In the latter part, the recent achievements in the field of smart antimicrobial surfaces with physical activation are discussed, with special attention on multiresponsive or multifunctional physically activated coatings. In particular, we mainly discussed the multistimuli surface triggering, which ensures a better degree of surface properties control, as well as simultaneous utilization of several strategies for surface protection, based on a principally different mechanism of antimicrobial action. We also mentioned several recent trends, including the development of the to-detect and to-kill hybrid approach, which ensures the surface activation in a right place at a right time.

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Electro-responsive surfaces with controllable wrinkling patterns for switchable light reflection–diffusion–grating devices

Cited by 15 publications

References 52 publications

Self-Assembly of Twisted Monolayer Cholesteric Films via Surface Tension Local Anisotropy: Implications for Multicolor Optical Tags

Self-Assembly of Twisted Monolayer Cholesteric Films via Surface Tension Local Anisotropy: Implications for Multicolor Optical Tags

Smart Polymer Surfaces with Complex Wrinkled Patterns: Reversible, Non-Planar, Gradient, and Hierarchical Structures

Physically Switchable Antimicrobial Surfaces and Coatings: General Concept and Recent Achievements

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